fclose

(PHP 4, PHP 5)

fclose — 关闭一个已打开的文件指针

说明

bool fclose ( resource $handle )

将 handle 指向的文件关闭。

如果成功则返回 TRUE，失败则返回 FALSE。

文件指针必须有效，并且是通过 fopen() 或 fsockopen() 成功打开的。

Example#1 一个简单 fclose() 例子


<?php
  $handle = fopen('somefile.txt', 'r');
  fclose($handle);
?>

feof

diskfreespace

Last updated: Sun, 25 Nov 2007

add a note User Contributed Notes
fclose

sineld at sineld dot com
23-Nov-2006 05:50


Do not forget, if you are going to read the contents of the file which you have already written via fwrite() or else you have to close the file first.

mark at markvange * com
04-May-2006 10:17


It is very important to make sure you clear any incoming packets out of the incoming buffer using fread() or some equivalent.  Although you can call fclose() the socket does not actually shut down until the inbound packets have been cleared.  This can lead to some confusion.

williamhamby at williamhamby dot net
07-Apr-2006 07:19


Trying to understand how 'end foreach' and 'endwhile' differ, I've encountered a problem I can't solve by myself. The following is a fairly easy stock portfolio script. Everything works, except at the end where I want to calculate the average of the gains as represented by $gain[$i].



<?php

$quantity="3";

$stocks=array("iso","grn","bdgr.pk");

$buydates=array("3 jan 2006","1 feb 2006","3 apr 2006");

$prices=array("0.32","0.20","0.95");

$recommends=array("hold","strong buy","buy");

$i=0;

echo"<tr>";

echo "\n<th align='center'>ticker</th>";

echo "\n<th align='center'>buy date</th>";

echo "\n<th align='center'>price $</th>";

echo "\n<th align='center'>recommend</th>";

echo "\n<th align='center'>value $</th>";

echo "\n<th align='center'>change %</th>\n</tr>\n";

foreach($stocks as $stock) {

$fp=fopen("http://","r");

$data=fgetcsv($fp,1000,",");

$values=$data[1];

echo "<tr>\n<td align='center'>".$stock."</td>";

echo "\n<td align='center'>".$buydates[$i]."</td>";

echo "\n<td align='center'>".$prices[$i]."</td>";

echo "\n<td align='center'>".$recommends[$i]."</td>";

echo "\n<td align='center'>".$values."</td>\n<td align='center'>";

echo $gain[$i]=round(((($values-$prices[$i])/$prices[$i])*100),2);

echo "</td>\n</tr>";

fclose ($fp);

$i++;

}

echo "\n<tr>\n<td align='center'>".$gain[$i]."<td>\n</tr>\n";

?>



Help?

James R. Steel
28-Nov-2005 10:02


In response to kumar mcmillan 'gotcha' note below, we get a different result on a W2K machine:



<?php

$file_pointer = fopen('textfile.dat', 'r');

fclose($file_pointer);

echo '$file_pointer is resource = ' . (is_resource($file_pointer) ? 'true': 'false');

?>



output:

$file_pointer is resource = false

kit dot lester at lycos dot co dot uk
18-Sep-2005 06:34


fclose() also clears any locks on the file, so if another process was being kept waiting for the lock to be cleared, fclose()ing will allow the other process to continue.



[Another "just-in-case" reason to habitually fclose() all files as soon as practical!]

jricher at jacquesricher dot com
01-Feb-2005 07:06


It is a GOOD_THING to check the return value from fclose(), as some operating systems only flush file output on close, and can, therefore, return an error from fclose(). You can catch severe data-eating errors by doing this. 



I learned this the hard way.

kumar mcmillan
30-Sep-2004 01:10


gotcha:



<?php



$file_pointer = fopen('data.dat', 'r');

fclose($file_pointer);



echo '$file_pointer is resource = ' . (is_resource($file_pointer) ? 'true': 'false');



?>



output:

$file_pointer is resource = true

daniel7 dot martinez at ps dot ge dot com
10-Sep-2001 05:06


Generally, it's always a good idea to close a file when you're done with it. It's very easy for something to go wrong and corrupt a file that hasn't been closed properly. If you're concerned about efficiency, the overhead is negligible.

add a note

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diskfreespace

Last updated: Sun, 25 Nov 2007